28-07-2017
Mathematics

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what is the value of x? and how did you get the answer

what is the value of x and how did you get the answer class=

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Banabanana Banabanana

28-07-2017

OA = OB = OC [radii] ⇒ ΔAOB and ΔCOB are isosceles ⇒
∠ABO = ∠OAB = 30°
∠CBO = ∠OCB = 50°
x = ∠ABO + ∠CBO = 30 + 50 = 80°

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